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  <title>返回指定文件的最后修改时间</title>
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  <div id="layout-content"><div id="function.ftp-mdtm" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">ftp_mdtm</h1>
    <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ftp_mdtm</span> &mdash; <span class="dc-title">返回指定文件的最后修改时间</span></p>

   </div>
   <div class="refsect1 unknown-examplet" id="refsect1-function.ftp-mdtm-unknown-examplet">
    <h3 class="title">说明</h3>
    <div class="methodsynopsis dc-description">
     <span class="methodname"><strong>ftp_mdtm</strong></span>
      ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$ftp_stream</code></span>
     , <span class="methodparam"><span class="type">string</span> <code class="parameter">$remote_file</code></span>
     ) : <span class="type">int</span></div>

    <p class="para rdfs-comment">
     <span class="function"><strong>ftp_mdtm()</strong></span> 检查指定文件的最后修改时间，并以 UNIX
     时间戳的方式返回。如果发生错误，或文件不存在则返回 -1。
    </p>
    <p class="para">
     <div class="example" id="example-5316">
      <p><strong>Example #1 <span class="function"><strong>ftp_mdtm()</strong></span> 例子</strong></p>
      <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'somefile.txt'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;connect&nbsp;to&nbsp;the&nbsp;server<br /></span><span style="color: #0000BB">$conn_id&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$ftp_server</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$login_result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_login</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ftp_user_name</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ftp_user_pass</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;&nbsp;get&nbsp;the&nbsp;last&nbsp;modified&nbsp;time<br /></span><span style="color: #0000BB">$buff&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_mdtm</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">);<br /><br />if&nbsp;(</span><span style="color: #0000BB">$buff&nbsp;</span><span style="color: #007700">!=&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;somefile.txt&nbsp;was&nbsp;last&nbsp;modified&nbsp;on:&nbsp;March&nbsp;26&nbsp;2003&nbsp;14:16:41.<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"</span><span style="color: #0000BB">$file</span><span style="color: #DD0000">&nbsp;was&nbsp;last&nbsp;modified&nbsp;on&nbsp;:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">date&nbsp;</span><span style="color: #007700">(</span><span style="color: #DD0000">"F&nbsp;d&nbsp;Y&nbsp;H:i:s."</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$buff</span><span style="color: #007700">);<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Couldn't&nbsp;get&nbsp;mdtime"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;close&nbsp;the&nbsp;connection<br /></span><span style="color: #0000BB">ftp_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
      </div>

     </div>
    </p>
    <p class="para">
     如果成功返回一个 UNIX 时间戳，否则返回 -1。
    </p>
    <blockquote class="note"><p><strong class="note">Note</strong>: 
     <p class="para">
      某些 FTP 服务器可能会不支持这个特性。
     </p>
    </p></blockquote>
    <blockquote class="note"><p><strong class="note">Note</strong>: 
     <p class="para">
      <span class="function"><strong>ftp_mdtm()</strong></span> 函数不适用于检查目录。
     </p>
    </p></blockquote>
   </div>

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